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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Leasing equipment, accumulated depreciation and allowances $ 3,782,025 $ 3,370,652
Accounts receivable, allowances 1,250 2,192
Finite-Lived Intangible Assets, Accumulated Amortization 277,631 264,791
Deferred financing costs $ 62,630 $ 42,747
Class of Stock [Line Items]    
Treasury Stock, Shares (in shares) 14,280,091 13,901,326
Preferred Shares    
Class of Stock [Line Items]    
Preferred Stock, Par or Stated Value Per Share (in dollars per share) $ 0.01 $ 0.01
Designated Common Stock    
Class of Stock [Line Items]    
Common Shares, Par Value (in dollars per share) $ 0.01 $ 0.01
Common Shares, Shares Authorized (in shares) 270,000,000 270,000,000
Common Shares, Shares Issued (in shares) 81,296,359 81,151,723
Undesignated Common Stock    
Class of Stock [Line Items]    
Common Shares, Par Value (in dollars per share) $ 0.01 $ 0.01
Common Shares, Shares Authorized (in shares) 800,000 7,800,000
Common Shares, Shares Outstanding (in shares) 0 0
Common Shares, Shares Issued (in shares) 0 0